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United States Patent | 5,151,779 |
Kanatsugu ,   et al. | September 29, 1992 |
A signal transmission system for high definition television that can handle a second television signal which is superior in quality to a first television signal such as an NTSC (National Television System Committee) television signal. The transmitting end of the system transmits a first television signal including a video signal, audio signals, etc., through a main transmission line, as well as a third television signal including a high definition components obtained as the difference between the second and the first television signal through an auxiliary transmission line. The receiving end of the system receives and synthesizes the first television signal transmitted through the main transmission line and the third television signal transmitted through the auxiliary transmission line to produce the second television signal.
Inventors: | Kanatsugu; Yasuaki (Tokyo, JP); Kurita; Taiichiro (Tokyo, JP); Nishizawa; Taiji (Tokyo, JP); Tanaka; Yutaka (Tokyo, JP); Yajima; Ryoichi (Tokyo, JP); Suzuki; Shoichi (Tokyo, JP); Kato; Hisakazu (Tokyo, JP); Enami; Kazumasa (Tokyo, JP); Okuda; Haruo (Tokyo, JP); Koizumi; Satoru (Tokyo, JP); Suganami; Hideki (Tokyo, JP); Takegahara; Toshiyuki (Tokyo, JP); Watanabe; Kaoru (Tokyo, JP) |
Assignee: | Nippon Hoso Kyokai (Tokyo, JP) |
Appl. No.: | 530760 |
Filed: | May 30, 1990 |
Current U.S. Class: | 375/240.25; 348/904 |
Intern'l Class: | H04N 007/08; H04N 011/06 |
Field of Search: | 358/12,140,141,14,135,23 |
4631574 | Dec., 1986 | LoCicero | 358/12. |
4661850 | Apr., 1987 | Strolle | 358/140. |
______________________________________ Input original audio signal: bandwidth 20 kHz sampling frequency 48 kHz Low-pass filter: upper limit 15 kHz First sampling frequency: 32 kHz Second sampling frequency: 16 kHz Third sampling frequency: 48 kHz ______________________________________